From 7fd6be5cef06d0bd495f4e03d33c4d6f04c36131 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Thu, 17 Nov 2016 16:37:40 +0100
Subject: add idempotency checks for /refresh/reveal, fixing #4793

---
 src/include/taler_exchangedb_plugin.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/include')

diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 02d41f2bf..19fb1d042 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -1359,6 +1359,27 @@ struct TALER_EXCHANGEDB_Plugin
                                       struct TALER_TransferPublicKeyP *tp);
 
 
+  /**
+   * Get signature of a new coin generated during refresh into
+   * the database indexed by the refresh session and the index
+   * of the coin.
+   *
+   * @param cls the @e cls of this struct with the plugin-specific state
+   * @param session database connection
+   * @param session_hash hash to identify refresh session
+   * @param newcoin_index coin index
+   * @param[out] ev_sig coin signature
+   * @return #GNUNET_OK on success, #GNUNET_NO if we have no such entry,
+   *         #GNUNET_SYSERR on error
+   */
+  int
+  (*get_refresh_out) (void *cls,
+                      struct TALER_EXCHANGEDB_Session *session,
+                      const struct GNUNET_HashCode *session_hash,
+                      uint16_t newcoin_index,
+                      struct TALER_DenominationSignature *ev_sig);
+
+
   /**
    * Insert signature of a new coin generated during refresh into
    * the database indexed by the refresh session and the index
@@ -1371,6 +1392,7 @@ struct TALER_EXCHANGEDB_Plugin
    * @param newcoin_index coin index
    * @param ev_sig coin signature
    * @return #GNUNET_OK on success
+   *         #GNUNET_SYSERR on error
    */
   int
   (*insert_refresh_out) (void *cls,
-- 
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